CN109995252A - A kind of voltage regulator circuit and switching power circuit - Google Patents
A kind of voltage regulator circuit and switching power circuit Download PDFInfo
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- CN109995252A CN109995252A CN201910324418.0A CN201910324418A CN109995252A CN 109995252 A CN109995252 A CN 109995252A CN 201910324418 A CN201910324418 A CN 201910324418A CN 109995252 A CN109995252 A CN 109995252A
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- module
- filter
- power supply
- input terminal
- voltage regulator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The present invention is suitable for switch power technology field, a kind of voltage regulator circuit and switching power circuit are provided, the embodiment of the present invention is by providing a kind of voltage regulator circuit being electrically connected with the power supply PWM chip and auxiliary winding of switching power circuit, make the induced current successively rectification module rectification through voltage regulator circuit of auxiliary winding, the filtering of first filter module, after division module partial pressure and Voltage stabilizing module pressure stabilizing, it is in faradic voltage within the scope of the pressure stabilizing value of the Voltage stabilizing module, the electronic switch module of voltage regulator circuit is connected, induced current flows to the second filter module through the electronic switching tube of voltage regulator circuit, the power end of power supply PWM chip is flowed to after the filtering of the second filter module, power supply PWM chip electrifying startup is set to work, it can be by the power end power supply all-the-time stable of power supply PWM chip within the scope of the pressure stabilizing value of Voltage stabilizing module, It is not influenced by the power source change of the production technology of transformer winding and power load.
Description
Technical field
The invention belongs to switch power technology field more particularly to a kind of voltage regulator circuits and switching power circuit.
Background technique
Switching Power Supply is a kind of device for converting electric energy, for being converted to AC power source or DC power supply needed for electrical equipment
Operating voltage or electric current, be widely used in various electrical equipments, provide the electric energy of high quality for electrical equipment.
However, at present power supply PWM (Pulse Width Modulation, the pulse width modulation) chip of Switching Power Supply by
The auxiliary winding of transformer is powered, and the voltage of the power end of power supply PWM chip is easy production technology and use by transformer winding
The influence of the power source change of electric loading, the production technology of transformer winding is undesirable or the power source change of power load is wider
In the case of, it is easy to cause the overtension of auxiliary winding, the protection to power supply PWM chip is triggered, causes power supply PWM chip without defeated
Out.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of voltage regulator circuit and switching power circuit, to solve switch at present
The power supply PWM chip of power supply is powered by the auxiliary winding of transformer, and the voltage of the power end of power supply PWM chip is easy by transformer
The influence of the power source change of the production technology and power load of winding, the production technology of transformer winding is undesirable or electricity consumption is negative
In the wider situation of the power source change of load, it is easy to cause the overtension of auxiliary winding, triggers the protection to power supply PWM chip,
Lead to the problem of power supply PWM chip is without output.
The first aspect of the embodiment of the present invention provides a kind of voltage regulator circuit, is applied to switching power circuit, the switch
Power circuit includes power supply PWM chip and auxiliary winding, and the voltage regulator circuit includes rectification module, the first filter module, partial pressure
Module, Voltage stabilizing module, electronic switch module and the second filter module；
The input terminal of the rectification module is electrically connected with one end of the auxiliary winding, the output end of the rectification module with
The input terminal of first filter module and the input terminal electrical connection of the division module；
The output end of first filter module and another termination of the auxiliary winding simulate ground；
The output end of the output end of the division module and the Voltage stabilizing module and the electronic switch module it is controlled
End and input terminal electrical connection；
The output termination simulation ground of the input terminal of the Voltage stabilizing module and second filter module；
The input terminal and the power supply PWM chip of the output end of the electronic switch module and second filter module
Power end electrical connection；
The induced current of the auxiliary winding is successively through rectification module rectification, first filter module filtering, institute
After stating division module partial pressure and the Voltage stabilizing module pressure stabilizing, the faradic voltage is in the pressure stabilizing value of the Voltage stabilizing module
In range, the electronic switch module conducting, the induced current flows to second filter module through the electronic switching tube,
The power end that the power supply PWM chip is flowed to after second filter module filtering, makes the power supply PWM chip electrifying startup
Work.
In one embodiment, the rectification module includes at least one first divider resistance and a diode；
At least one described first divider resistance and diode head and the tail are sequentially connected in series, positioned at described first point of head end
The head end of piezoresistance is the input terminal of the Voltage stabilizing module, and the cathode positioned at the diode of tail end is the Voltage stabilizing module
Output end.
In one embodiment, first filter module includes at least one first filter capacitor；
The anode of at least one first filter capacitor connects the input terminal for constituting first filter module altogether, it is described extremely
The cathode of few first filter capacitor connects the output end for constituting first filter module altogether.
In one embodiment, the division module includes at least two second divider resistances；
At least two second divider resistance is parallel with one another, and the head end of at least two second divider resistance connects structure altogether
At the input terminal of the division module, the tail end of at least two second divider resistance connects altogether constitutes the defeated of the division module
Outlet.
In one embodiment, the division module further includes at least one third divider resistance；
At least one described third divider resistance head and the tail are sequentially connected in series, positioned at the head end of the third divider resistance of head end
Connect the first output end for constituting the division module, first output altogether with the tail end of at least two second divider resistance
End is electrically connected with the input terminal of the electronic switch module, and the tail end positioned at the third divider resistance of tail end is the partial pressure
The second output terminal of module, the output end of the second output terminal and the Voltage stabilizing module and the electronic switch module it is controlled
End electrical connection.
In one embodiment, the Voltage stabilizing module includes at least one zener diode；
At least one zener diode head and the tail are sequentially connected in series, and the cathode positioned at the zener diode of head end is institute
The output end for stating Voltage stabilizing module, positioned at the input terminal of the just extremely described Voltage stabilizing module of the zener diode of tail end.
In one embodiment, the electronic switch module includes NPN type triode；
The base stage of the NPN type triode, collector and emitter are respectively the controlled end, defeated of the electronic switch module
Enter end and output end.
In one embodiment, second filter module includes at least one second filter capacitor；
The anode of at least one second filter capacitor connects the input terminal for constituting second filter module altogether, it is described extremely
The cathode of few second filter capacitor connects the output end for constituting second filter module altogether.
The second aspect of the embodiment of the present invention provides a kind of switching power circuit, including power supply PWM chip, auxiliary winding
And above-mentioned voltage regulator circuit.
In one embodiment, the topological structure of the switching power circuit is positive exciting topological structure, reverse exciting topological
Structure, push-pull type topological structure, semibridge system topological structure or full-bridge type topological structure
The embodiment of the present invention a kind of is electrically connected with the power supply PWM chip and auxiliary winding of switching power circuit by providing
Voltage regulator circuit, make the rectification module rectification successively through voltage regulator circuit of the induced current of auxiliary winding, the filtering of the first filter module, point
After die block partial pressure and Voltage stabilizing module pressure stabilizing, it is in faradic voltage within the scope of the pressure stabilizing value of the Voltage stabilizing module, makes
The electronic switch module of voltage regulator circuit is connected, and induced current flows to the second filter module through the electronic switching tube of voltage regulator circuit, passes through
The power end of power supply PWM chip is flowed to after the filtering of second filter module, power supply PWM chip electrifying startup is made to work, it can will be electric
The power end power supply all-the-time stable of source PWM chip is within the scope of the pressure stabilizing value of Voltage stabilizing module, not by the production work of transformer winding
The influence of the power source change of skill and power load.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the structural schematic diagram of voltage regulator circuit provided in an embodiment of the present invention；
Fig. 2 is the circuit diagram of voltage regulator circuit provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram of switching power circuit provided in an embodiment of the present invention.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical solution in the embodiment of the present invention are explicitly described, it is clear that described embodiment is the present invention one
The embodiment divided, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, should fall within the scope of the present invention.
Description and claims of this specification and term " includes " and their any deformations in above-mentioned attached drawing, meaning
Figure, which is to cover, non-exclusive includes.Such as process, method or system comprising a series of steps or units, product or equipment do not have
It is defined in listed step or unit, but optionally further comprising the step of not listing or unit, or optionally also wrap
Include the other step or units intrinsic for these process, methods, product or equipment.In addition, term " first ", " second " and
" third " etc. is for distinguishing different objects, not for description particular order.
One embodiment of the present of invention provides a kind of voltage regulator circuit, applied to the switching power circuit in Switching Power Supply, opens
Powered-down source circuit includes power supply PWM chip and transformer, and transformer includes armature winding, secondary windings and auxiliary winding, auxiliary
Winding is electrically connected with the power end of power supply PWM chip, for providing operating voltage for power supply PWM chip.
In a particular application, the topological structure of switching power circuit can be positive exciting topological structure, reverse exciting topological knot
Any feasible topological structure such as structure, push-pull type topological structure, semibridge system topological structure or full-bridge type topological structure.
It is being applied particularly to, power supply PWM chip can be selected any type of with overvoltage protection function according to actual needs
The power supply PWM chip of energy, the over-voltage protecting function of power supply PWM chip are, when the power end voltage of power supply PWM chip is more than power supply
When the rated operational voltage at end, power supply PWM chip is in overvoltage protection state, output end non-transformer output, so that electricity consumption is negative
Carry non-transformer input.
In a particular application, when the technique of transformer is undesirable, the coil windings of transformer between layers not around
When good or power load voltage or curent change wider range, the overtension of the auxiliary winding of transformer will lead to, thus
The power end voltage for leading to power supply PWM chip is more than rated operational voltage, and power supply PWM chip is made to be in overvoltage protection state.
As shown in Figure 1, voltage regulator circuit 100 provided in this embodiment includes that rectification module 1, first filters 2 pieces of mould, partial pressure mould
Block 3, Voltage stabilizing module 4, electronic switch module 5 and the second filter module 6；
The input terminal of rectification module 1 is electrically connected with one end of auxiliary winding L3, the output end of rectification module 1 and the first filtering
The input terminal of module 2 and the input terminal electrical connection of division module 3；
The output end of first filter module 2 and another termination of auxiliary winding L3 simulate ground；
The controlled end and input terminal of the output end of division module 3 and the output end of Voltage stabilizing module 4 and electronic switch module 5
Electrical connection；
The output termination simulation ground of the input terminal of Voltage stabilizing module 4 and the second filter module 6；
The power end electricity of the input terminal and power supply PWM chip U1 of the output end of electronic switch module 5 and the second filter module 6
Connection；
The induced current of auxiliary winding L3 successively divide by the rectified rectification of module 1, the filtering of the first filter module 2, division module 3
After pressure and 4 pressure stabilizing of Voltage stabilizing module, faradic voltage is within the scope of the pressure stabilizing value of Voltage stabilizing module 4, and electronic switch module 5 is led
Logical, induced current flows to the second filter module 6 through electronic switching tube 5, flows to power supply PWM core after the filtering of the second filter module 6
The power end of piece U1 makes power supply PWM chip U1 electrifying startup work.
In a particular application, rectification module, the first filter module, division module, Voltage stabilizing module, electronic switch module and
Two filter modules can be realized using any device, circuit or chip with existing capability according to actual needs.
In one embodiment, the rectification module includes at least one first divider resistance and a diode；
At least one described first divider resistance and diode head and the tail are sequentially connected in series, positioned at described first point of head end
The head end of piezoresistance is the input terminal of the Voltage stabilizing module, and the cathode positioned at the diode of tail end is the Voltage stabilizing module
Output end.
In a particular application, the quantity of the first divider resistance and resistance value size included by rectification module can be according to reality
It needs to be configured.
As shown in Fig. 2, illustratively showing rectification module 1 includes a divider resistance and a diode, difference table
It is shown as first resistor R1 and diode D1.
In one embodiment, first filter module includes at least one first filter capacitor；
The anode of at least one first filter capacitor connects the input terminal for constituting first filter module altogether, it is described extremely
The cathode of few first filter capacitor connects the output end for constituting first filter module altogether.
In a particular application, the quantity and capacitance size of the first filter capacitor included by the first filter module can roots
It is configured according to actual needs, when the first filter module includes at least two first filter capacitor, at least two first filtering
Capacitor is parallel with one another.
As shown in Fig. 2, illustratively showing the first filter module 2 includes two the first filter capacitors, it is expressed as
First capacitor C1 and the second capacitor C2；Wherein, first capacitor C1 is electrolytic capacitor, and the second capacitor C2 is patch capacitor.
In one embodiment, the division module includes at least two second divider resistances；
At least two second divider resistance is parallel with one another, and the head end of at least two second divider resistance connects structure altogether
At the input terminal of the division module, the tail end of at least two second divider resistance connects altogether constitutes the defeated of the division module
Outlet.
In a particular application, the quantity of the second partial pressure and resistance value size can be according to actual needs included by division module
It is configured.At least two second divider resistances are parallel with one another, to prevent one of them second divider resistance because of the excessive hair of voltage
After scalding damage, other second divider resistances can also continue to play partial pressure effect, and the stability and robust of division module can be improved
Property.
As shown in Fig. 2, illustratively showing division module 3 includes three the second divider resistances, it is expressed as second
Resistance R2,3rd resistor R3 and the 4th resistance R4.
In one embodiment, the division module further includes at least one third divider resistance；
At least one described third divider resistance head and the tail are sequentially connected in series, positioned at the head end of the third divider resistance of head end
Connect the first output end for constituting the division module, first output altogether with the tail end of at least two second divider resistance
End is electrically connected with the input terminal of the electronic switch module, and the tail end positioned at the third divider resistance of tail end is the partial pressure
The second output terminal of module, the output end of the second output terminal and the Voltage stabilizing module and the electronic switch module it is controlled
End electrical connection.
In a particular application, the quantity of third divider resistance and resistance value size included by division module can be according to reality
It needs to be configured.
As shown in Fig. 2, illustratively showing division module 3 includes a third divider resistance, it is expressed as the 5th resistance
R5。
In one embodiment, the Voltage stabilizing module includes at least one zener diode；
At least one zener diode head and the tail are sequentially connected in series, and the cathode positioned at the zener diode of head end is institute
The output end for stating Voltage stabilizing module, positioned at the input terminal of the just extremely described Voltage stabilizing module of the zener diode of tail end.
In a particular application, the quantity of zener diode included by Voltage stabilizing module and pressure stabilizing value can be according to actual needs
It is configured, the pressure stabilizing value of zener diode can be set to the rated operational voltage less than or equal to power supply PWM chip, will
Voltage regulator circuit is exported to the voltage stabilization of the power end of power supply PWM chip and is worked in the amount for being less than or equal to power supply PWM chip
It in the range of voltage, prevents the power end voltage of power supply PWM chip excessive, and triggers the over-voltage protecting function of power supply PWM chip,
Cause the output end of power supply PWM chip without output.
As shown in Fig. 2, illustratively showing Voltage stabilizing module 4 includes a zener diode ZD1.
In one embodiment, the electronic switch module includes NPN type triode；
The base stage of the NPN type triode, collector and emitter are respectively the controlled end, defeated of the electronic switch module
Enter end and output end.
In a particular application, NPN type triode can be using equivalence replacement as PNP type triode or other kinds of crystal
Pipe, such as field-effect tube.
As shown in Fig. 2, illustratively showing electronic switch module 5 includes NPN type triode Q1.
In one embodiment, second filter module includes at least one second filter capacitor；
The anode of at least one second filter capacitor connects the input terminal for constituting second filter module altogether, it is described extremely
The cathode of few second filter capacitor connects the output end for constituting second filter module altogether.
In a particular application, the quantity and capacitance size of the second filter capacitor included by the second filter module can roots
It is configured according to actual needs, when the second filter module includes at least two second filter capacitor, at least two second filtering
Capacitor is parallel with one another.
As shown in Fig. 2, illustratively showing the second filter module 6 includes two the second filter capacitors, it is expressed as
The emitter of third capacitor C3 and the 4th capacitor C4, NPN type triode Q1, the anode of third capacitor C3 and the 4th capacitor C4 are just
Pole is electrically connected with the power end VCC of power supply PWM chip U1；Wherein, third capacitor C3 is electrolytic capacitor, and the 4th capacitor C4 is patch
Capacitor.
The present embodiment is by providing a kind of pressure stabilizing being electrically connected with the power supply PWM chip and auxiliary winding of switching power circuit
Circuit makes rectification module rectification, the filtering of the first filter module, partial pressure mould of the induced current of auxiliary winding successively through voltage regulator circuit
After block partial pressure and Voltage stabilizing module pressure stabilizing, it is in faradic voltage within the scope of the pressure stabilizing value of the Voltage stabilizing module, makes pressure stabilizing
The electronic switch module of circuit is connected, and induced current flows to the second filter module through the electronic switching tube of voltage regulator circuit, through second
The power end that power supply PWM chip is flowed to after filter module filtering, makes power supply PWM chip electrifying startup work, can be by power supply PWM
The power end power supply all-the-time stable of chip is within the scope of the pressure stabilizing value of Voltage stabilizing module, not by the production technology of transformer winding and use
The influence of the power source change of electric loading.
One embodiment of the present of invention also provides a kind of switching power circuit comprising power supply PWM chip, auxiliary winding with
And voltage regulator circuit.It should be understood that armature winding, secondary windings, power supply that switching power circuit necessarily further includes transformer turn
Circuit etc. is changed, it is merely exemplary in the present embodiment to describe part relevant to inventive point.
As shown in figure 3, one embodiment of the present of invention provides a kind of switching power circuit using reverse exciting topological structure,
Including voltage regulator circuit 100, power-switching circuit 200, current rectifying and wave filtering circuit 300, transformer T1, electronic switching circuit 400 and electricity
Source chip circuit 500, transformer T1 include armature winding L1, secondary windings L2 and auxiliary winding L3, and power supply chip circuit includes
Power supply PWM chip U1.
In a particular application, power-switching circuit can select exchange to-DC switching circuit or direct current according to actual needs
To-DC switching circuit etc..Current rectifying and wave filtering circuit can select diode, capacitor and resistance according to actual needs or have corresponding
The device or chip of function realize that it is real that electronic switching circuit can select any type of transistor etc. according to actual needs
It is existing, for example, triode or field-effect tube.
As shown in figure 3, showing power-switching circuit 200 illustratively as exchange to-DC switching circuit, power supply is converted
Circuit 200 include fuse F1, thermistor NTC1, resistor MOV1, the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7,
8th capacitor C8, the 9th capacitor C9, the 6th resistance R6, the 7th resistance R7, common mode inductance LF1 and rectifier bridge (including four two poles
Pipe is expressed as the second diode D2, third diode D3, the 4th diode D4 and the 5th diode D5)；
Current rectifying and wave filtering circuit 300 includes the tenth capacitor C10, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10 and the
11 resistance R11, the 6th diode D6 and the 7th diode D7；
Electronic switching circuit 400 includes the 11st capacitor C11, twelfth resistor R12, thirteenth resistor R13, the 14th electricity
Hinder R14, the 15th resistance R15 and the 16th resistance R16, N-channel field-effect tube Q2 and PNP type triode Q3；
Power supply chip circuit 500 includes power supply PWM chip U1, the 17th resistance R17, the 18th resistance R18, the 19th electricity
Hinder R19, the 20th resistance R20, the 12nd capacitor C12, the 13rd capacitor C13, phototriode Q4；
One end of fuse F1 is electrically connected with firewire L, the other end of fuse F1 and one end, the 5th electricity of resistor MOV1
Hold the positive input terminal electrical connection of the anode of C5, the anode of the 7th capacitor C7, one end of the 6th resistance R6 and common mode inductance LF1；
One end of thermistor NTC1 is electrically connected with zero curve N, and the other end of thermistor NTC1 is another with resistor MOV1's
One end, the cathode of the 6th capacitor C6, the 7th capacitor C7 cathode, one end of the 7th resistance R7 and the negative input of common mode inductance LF1
End electrical connection；
The cathode of 5th capacitor C5 and the anode of the 6th capacitor C6 are connected to power ground altogether；
The other end of 6th resistance R6 is electrically connected with the other end of the 7th resistance R7；
The positive output end of common mode inductance LF1 is electrically connected with the positive input terminal of rectifier bridge, the negative output terminal of common mode inductance LF1 with
The negative input end of rectifier bridge is electrically connected；
The anode of the positive output end of rectifier bridge and the 8th capacitor C8, the anode of the 9th capacitor C9, the 17th resistance R17 one
One end electrical connection at end, one end of the 8th resistance R8, the anode of the tenth capacitor C10 and armature winding L1, the negative output of rectifier bridge
End is connected to simulation ground with the cathode of the 8th capacitor C8 and the cathode of the 9th capacitor C9 altogether；
The other end of 8th resistance R8 and one end, one end of the tenth resistance R10, eleventh resistor R11 of the 9th resistance R9
One end, the 6th diode D6 cathode and the 7th diode D7 cathode electrical connection；
The other end and eleventh resistor of the other end of the cathode of tenth capacitor C10 and the 9th resistance R9, the tenth resistance R10
The other end of R11 is electrically connected；
Anode and the anode of the 7th diode D7, the other end of armature winding L1, the N-channel field-effect of 6th diode D6
The drain electrode of pipe Q2 and the anode electrical connection of the 11st capacitor C11；
The cathode of 11st capacitor C11 and one end of twelfth resistor R12, one end and the 14th of thirteenth resistor R13
One end of resistance R14 is electrically connected；
Another termination of twelfth resistor R12 simulates ground；
The grid of the other end of thirteenth resistor R13 and N-channel field-effect tube Q2, the emitter of PNP type triode and the
One end of 15 resistance R15 is electrically connected；
The other end of 14th resistance R14 is electrically connected with the collector of PNP type triode；
The output end OUT electricity of the other end of the 15th resistance R15 and one end of the 16th resistance R16 and power supply PWM chip
Connection；
The other end of 16th resistance R16 is electrically connected with the base stage of PNP type triode；
The source electrode of N-channel field-effect tube Q2 is the output end of electronic switching circuit 400；
The line input HV of power supply PWM chip U1 is electrically connected with one end of the 18th resistance R18, the 18th resistance R18
The other end be electrically connected with the other end of the 17th resistance R17；
The power end VCC of power supply PWM chip U1 is electrically connected with the output end of electronic switch module 5；
The overvoltage protection end RT of power supply PWM chip U1 is electrically connected with one end of the 19th resistance R19, the 19th resistance R19
The other end and the ground terminal GND of power supply PWM chip U1, the emitter of photosensitive triode Q4, the 12nd capacitor C12 cathode and
The cathode of 13rd capacitor C13 is connected to simulation ground altogether；
The collector and the 12nd capacitor of the current compensation control terminal COMP and phototriode Q4 of power supply PWM chip U1
The anode electrical connection of C12；
One end of the current detecting end CS and the 20th resistance R20 of power supply PWM chip U1 and the anode of the 13rd capacitor C13
Electrical connection；
The other end of 20th resistance R20 is the current detecting end of power supply chip circuit 500；
The current detecting end of secondary windings L2, the output end of electronic switching circuit 400 and power supply chip circuit 500 with use
Electric loading is electrically connected, and power load is not shown in Fig. 3.
In a particular application, the power load connecting with switching power circuit can be configured according to actual needs, this
Part relevant to switching power circuit is only introduced in embodiment.
In a particular application, OB5269 cake core specifically can be selected in power supply PWM chip, and N-channel field-effect tube Q2 can be waited
Effect replaces with triode or P-channel field-effect transistor (PEFT) pipe, and PNP type triode Q3 can be using equivalence replacement as three pole of field-effect tube or NPN type
Pipe.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (10)
1. a kind of voltage regulator circuit, which is characterized in that be applied to switching power circuit, the switching power circuit includes power supply PWM
Chip and auxiliary winding, the voltage regulator circuit include rectification module, the first filter module, division module, Voltage stabilizing module, electronic cutting
Close module and the second filter module；
The input terminal of the rectification module is electrically connected with one end of the auxiliary winding, the output end of the rectification module with it is described
The input terminal of first filter module and the electrical connection of the input terminal of the division module；
The output end of first filter module and another termination of the auxiliary winding simulate ground；
The output end of the output end of the division module and the Voltage stabilizing module and the controlled end of the electronic switch module and
Input terminal electrical connection；
The output termination simulation ground of the input terminal of the Voltage stabilizing module and second filter module；
The output end of the electronic switch module and the input terminal of second filter module and the power supply of the power supply PWM chip
End electrical connection；
The induced current of the auxiliary winding is successively through rectification module rectification, first filter module filtering, described point
After die block partial pressure and the Voltage stabilizing module pressure stabilizing, the faradic voltage is in the pressure stabilizing value range of the Voltage stabilizing module
Interior, the electronic switch module conducting, the induced current flows to second filter module through the electronic switching tube, through institute
The power end for flowing to the power supply PWM chip after the second filter module filters is stated, the power supply PWM chip electrifying startup work is made
Make.
2. voltage regulator circuit as described in claim 1, which is characterized in that the rectification module includes at least one first partial pressure electricity
Resistance and a diode；
At least one described first divider resistance and diode head and the tail are sequentially connected in series, positioned at the first partial pressure electricity of head end
The head end of resistance is the input terminal of the Voltage stabilizing module, and the cathode positioned at the diode of tail end is the output of the Voltage stabilizing module
End.
3. voltage regulator circuit as described in claim 1, which is characterized in that first filter module includes at least one first filter
Wave capacitor；
The anode of at least one first filter capacitor connects the input terminal for constituting first filter module altogether, and described at least one
The cathode of a first filter capacitor connects the output end for constituting first filter module altogether.
4. voltage regulator circuit as described in claim 1, which is characterized in that the division module includes at least two second partial pressure electricity
Resistance；
At least two second divider resistance is parallel with one another, and the head end of at least two second divider resistance connects altogether constitutes institute
The input terminal of division module is stated, the tail end of at least two second divider resistance connects the output for constituting the division module altogether
End.
5. voltage regulator circuit as claimed in claim 4, which is characterized in that the division module further includes at least one third partial pressure
Resistance；
At least one described third divider resistance head and the tail are sequentially connected in series, head end and institute positioned at the third divider resistance of head end
The tail end for stating at least two second divider resistances connects the first output end for constituting the division module altogether, first output end with
The input terminal of the electronic switch module is electrically connected, and the tail end positioned at the third divider resistance of tail end is the division module
Second output terminal, the output end of the second output terminal and the Voltage stabilizing module and the controlled end electricity of the electronic switch module
Connection.
6. voltage regulator circuit as described in claim 1, which is characterized in that the Voltage stabilizing module includes at least one two pole of pressure stabilizing
Pipe；
At least one zener diode head and the tail are sequentially connected in series, and the cathode positioned at the zener diode of head end is described steady
The output end of die block, positioned at the input terminal of the just extremely described Voltage stabilizing module of the zener diode of tail end.
7. voltage regulator circuit as described in claim 1, which is characterized in that the electronic switch module includes NPN type triode；
The base stage of the NPN type triode, collector and emitter are respectively the controlled end of the electronic switch module, input terminal
And output end.
8. voltage regulator circuit as described in claim 1, which is characterized in that second filter module includes at least one second filter
Wave capacitor；
The anode of at least one second filter capacitor connects the input terminal for constituting second filter module altogether, and described at least one
The cathode of a second filter capacitor connects the output end for constituting second filter module altogether.
9. a kind of switching power circuit, which is characterized in that including power supply PWM chip, auxiliary winding and such as claim 1~8
Described in any item voltage regulator circuits.
10. switching power circuit as claimed in claim 9, which is characterized in that the topological structure of the switching power circuit is
Positive activation type topological structure, reverse exciting topological structure, push-pull type topological structure, semibridge system topological structure or full-bridge type topological structure.
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| CN201910324418.0A CN109995252A (en) | 2019-04-22 | 2019-04-22 | A kind of voltage regulator circuit and switching power circuit |
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| CN201910324418.0A CN109995252A (en) | 2019-04-22 | 2019-04-22 | A kind of voltage regulator circuit and switching power circuit |
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